Theoretical evaluation on effect of internal heat exchanger in ejector expansion transcritical CO2 refrigeration cycle

Theoretical evaluation on effect of internal heat exchanger in ejector expansion transcritical CO2 refrigeration cycle
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喷射膨胀跨临界CO2制冷循环内换热器效果的理论评价

DOI:
10.1016/j.applthermaleng.2012.08.022
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发表时间:
2013-01
影响因子:
6.4
通讯作者:
Li, Min-xia
Li, Min-xia
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhang, Zhen-ying;Ma, Yi-tai;Wang, Hong-li;Li, Min-xia

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为了节约能源,跨临界co2制冷系统的性能需要进一步改进。基于热力学第一定律,从理论上分析了内热交换器对喷射器膨胀式跨临界co2制冷系统性能的影响。研究了影响系统效率的可能参数。得到了带和不带IHE的喷射器膨胀跨临界co2制冷循环中喷射器夹带比、压力恢复、喷射器效率和性能系数(COP)的变化规律。研究发现,在相同的气体冷却器压力下,在co2喷射器制冷循环中加入IHE增加了喷射器的夹带比和喷射器效率,降低了压力恢复。与传统节流阀循环不同,在喷射器膨胀循环中,添加IHE并不总能改善系统性能。能否提高引射器循环的能量效率取决于引射器的等熵效率水平。从能源效率的角度来看,IHE的利用仅适用于喷射器等熵效率较低或喷射器出口/蒸发器温度较高的情况。
The performance of the transcritical CO2refrigeration system requires further improvement in order to save energy. In this paper, the effect of the internal heat exchanger (IHE) on the performance of the ejector expansion transcritical CO2refrigeration system is analyzed theoretically based on the first law of thermodynamics. The possible parameters affecting system efficiency are investigated. The variation of ejector entrainment ratio, pressure recovery, ejector efficiency and the coefficient of performance (COP) is obtained for the ejector expansion transcritical CO2refrigeration cycles with and without IHE. It is found that the addition of IHE in the CO2ejector refrigeration cycle increases the ejector entrainment ratio and the ejector efficiency, and decreases pressure recovery under the same gas cooler pressures. Unlike in a conventional throttle valve cycle, an IHE addition does not always improve the system performance in the ejector expansion cycle. Whether the energy efficiency of the ejector cycle by IHE can be improved depends on the isentropic efficiency level of the ejector. The utilization of IHE is only applicable in the cases of lower ejector isentropic efficiencies or higher gas cooler exit/evaporator temperatures for the ejector expansion system from the view of energy efficiency.
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